1 <?xml version="1.0" encoding="UTF-8"?>
3 <page xmlns="http://lambdadelta.info/"
4 description = "\lambda\delta home page"
5 title = "\lambda\delta home page"
6 head = "The Formal Systems of the λδ (\lambda\delta) Family"
8 <sitemap name="sitemap"/>
10 <!-- ===================================================================== -->
12 <section3 name="milestones">Milestones</section3>
14 <news class="gamma" date="December 2015.">
15 <rlink to="implementation.html#v3">"Helena 0.8.3"</rlink> is released.
18 <news class="delta" date="August 2015.">
19 The specification of λδ version 2A1 is concluded.
22 <news class="gamma" date="June 2015.">
23 The corrected specification of Landau's "Grundlagen der Analysis"
24 is validated in a λProlog implementation of λδ version 3.
27 <news class="delta" date="March 2015.">
28 The specification of λδ version 1 is validated by
29 <link to="http://matita.cs.unibo.it/">Matita 0.99.2</link>.
32 <news class="gamma" date="February 2015.">
33 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is updated.
35 The translated specification of Landau's "Grundlagen der Analysis"
36 is validated in CC by <link to="http://coq.inria.fr/">Coq 8.4.3</link>.
40 <news class="delta" date="January 2015.">
41 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
42 is updated with backports from the abandoned specification of λδ version 2.
45 <news class="gamma" date="December 2014.">
46 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
48 The corrected specification of Landau's "Grundlagen der Analysis"
49 is validated in λδ version 3.
53 <news class="gamma" date="October 2014.">
54 <rlink to="documentation.html#ldJ2a">λδ version 2A1</rlink>
58 <news class="beta" date="July 2014.">
59 A new version of this site is online.
62 <news class="beta" date="June 2014.">
63 <rlink to="documentation.html#ldP2c">First communication on λδ version 2.</rlink>
66 <news class="alpha" date="December 2012.">
67 The character "_" is removed from the denomination "lambda_delta":
69 The denomination "\lambda\delta" is used in λδ-related texts.
71 The denomination "lambdadelta" is used in λδ-related identifiers.
73 Permanent λδ URL acquired:
74 <rlink to="">http://lambdadelta.info/</rlink>
75 (pointing at this site).
79 <news class="alpha" date="September 2011.">
80 The denomination "lambda-delta" changes to "lambda_delta":
82 The character "-" is reserved in λδ textual syntax
83 (recognized by "Helena 0.8.1").
85 Eventually, the occurrences of the character "-"
86 will be replaced by "_" in all λδ-related identifiers.
88 In particular, this refactoring involves file names and path names.
92 <news class="alpha" date="April 2011.">
93 The specification of <rlink to="specification.html#v2">λδ version 2</rlink>
94 and related topics is restarted in
95 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
98 <news class="delta" date="February 2011.">
99 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
102 <news class="alpha" date="December 2010.">
103 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
106 <news class="beta" date="November 2010.">
107 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
110 <news class="beta" date="September 2009.">
111 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
112 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
115 <news class="alpha" date="June 2009.">
116 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
117 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
120 <news class="alpha" date="September 2008.">
124 <news class="delta" date="July 2008.">
125 <rlink to="documentation.html#ldJ1a">First journal paper on λδ</rlink>
126 accepted for publication.
129 <news class="delta" date="July 2008.">
130 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
131 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
132 of the λδ version 1 for Coq 7.3.1.
135 <news class="delta" date="June 2008.">
136 The <rlink to="specification.html#static1">
137 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
141 <news class="delta" date="May 2008.">
142 The specification of λδ version 1 is concluded.
145 <news class="alpha" date="March 2008.">
146 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
149 <news class="gamma" date="September 2007.">
150 The <rlink to="specification.html#dynamic1">
151 specification of λδ version 1 for Matita 0.4</rlink>
155 <news class="gamma" date="November 2006.">
156 <rlink to="documentation.html#ldR1b">λδ version 1</rlink>
160 <news class="beta" date="December 2005.">
161 <rlink to="documentation.html#ldP1a">First communication on λδ version 1</rlink>.
164 <news class="alpha" date="May 2004.">
165 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
166 is started with Coq 7.3.1.
169 <!-- ===================================================================== -->
171 <section3 name="visibility">Visibility</section3>
173 <news class="alpha" date="June 2014.">
174 The <link to="http://www.google.com/">Google</link>
175 search for "formal system lambda delta" gives
176 5 resources about the λδ family in the first 6 results.
179 <news class="alpha" date="June 2014.">
180 The <link to="http://www.yahoo.com/">Yahoo</link>
181 search for "formal system lambda delta" gives
182 4 resources about the λδ family in the first 5 results.